[Coco] CoCo repair-upgrade
snhirsch at gmail.com
Tue Sep 27 10:40:16 EDT 2011
On Tue, 27 Sep 2011, Mark McDougall wrote:
> On 27/09/2011 8:26 AM, Chad H wrote:
>> Actually, that's EXACTLY what I used...I tried desoldering braid
>> first...mixed results. Tried vacuum desoldering bulb., only seems to
>> work if hit the part real quick before it cools.
> I use a $5 spring-loaded desoldering 'pump' myself. With a bit of practice,
> just as good as any fancy-schmancy desoldering tool. The trick is to use
> *enough* solder; some people seem to think that because you're trying to
> remove the solder, starting with less is better. But the exact opposite is
> true - generally you need to *add* solder before you start.
This is also true with dedicated vacuum desoldering stations.
> I'm about to attack an Acorn A3000 with a half-dozen 32-40 pin sockets that
> need removing. Not looking forward to it, but just got an SMT rework station
> so may try to put that to work on it...
I broke down earlier this year and purchased a Circuit Specialists
"BlackJack" combo tool. It comes with a temperature-controlled soldering
iron, vacuum desoldering tool and hot-air reflow tool (the soldering iron
and desoldering tool are mutually exclusive in terms of configuration).
Should have done this years ago...
A proper desoldering tool makes the difficult absolutely trivial once you
get the temperature settings right. At present, my hot-air reflow
technique is a bit crude, but I was able to repair battery leak dameage
on my Amiga A4000 (remove and replace a number of SMT 74LS parts along
with trace repair). Spending a lot of time practicing on dead PC
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